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A SO-DIMM, SODIMM, or small outline dual in-line memory module, is a type of computer memory built using integrated circuits.SO-DIMMs are a smaller alternative to a DIMM, being roughly half the size of regular DIMMs. SO-DIMMs are often used in systems that have limited space, which include laptops, notebooks, small-footprint personal computers such as those based on Mini-ITX motherboards. Sep 14, 2014 Intel's Universal DIMM Initiative in Notebooks Will Make DDR3 and DDR4 Compatible in the Same Slot - IDF 14 So far DDR4 support exists only within the Haswell-E, HEDT platform. However, with this.

A 200-pin PC2-5300 DDR2 SO-DIMM
A 204-pin PC3-10600 DDR3 SO-DIMM
A comparison between 200-pin DDR and DDR2 SDRAM SO-DIMMs, and a 204-pin DDR3 SO-DIMM module[1]
A SO-DIMM slot on a computer motherboard

A SO-DIMM, SODIMM, or small outline dual in-line memory module, is a type of computer memory built using integrated circuits. SO-DIMMs are a smaller alternative to a DIMM, being roughly half the size of regular DIMMs.

SO-DIMMs are often used in systems that have limited space, which include laptops, notebooks, small-footprint personal computers such as those based on Mini-ITXmotherboards, high-end upgradable office printers, and networking hardware such as routers and NAS devices.[2]

Visual identification[edit]

Most types of SO-DIMMs can be recognized visually by the distinctive notches that 'key' them for different applications:[1]

  • 100-pin SO-DIMMs (SDR SDRAM) have two notches.[3]
  • 144-pin SO-DIMMs (SDR SDRAM) have a single notch near the center.[4]
  • 200-pin SO-DIMMs (DDR SDRAM or DDR2 SDRAM) have a single notch nearer to one side.[5] The exact location of this notch varies (read below).
  • 204-pin SO-DIMMs (DDR3 SDRAM) have a single notch closer to the center than on 200-pin SO-DIMMs.[6]
  • 260-pin SO-DIMMs (DDR4 SDRAM), 69.6 mm (2.74 inches) wide and 30 mm (1.2 inches) high, making them 2 mm (0.079 inches) wider than DDR3 SO-DIMMs, with a single notch after pin 144.[7]
  • 260-pin SO-DIMMs (UniDIMM), 69.6 mm (2.74 inches) wide and 30 mm (1.2 inches) or 20 mm (0.79 inches) high, with a single notch placed differently than on DDR3 SO-DIMMs.[8][9]

Variants of 200-pin SO-DIMMs[edit]

The 200-pin SO-DIMM can be of the types DDR and DDR2. In both cases the notch is located at one fifth of the board length (20 pins + notch + 80 pins), but in DDR2 the notch is located slightly closer to the center of the board. These two types of memory are not interchangeable. The different notch locations are designed to prevent cross-installation, aiding at the same time in visually identifying 200-pin SO-DIMM modules.[1]

This variance is designed to prevent coupling of memory and controllers of different DDR generations due to electrical incompatibility. DDR SO-DIMMs operate at 2.5 V while DDR2 SO-DIMMs operate at 1.8 V.[10]

Variants of DDR3 SO-DIMMs[edit]

These modules, while using the same physical layout, may differ in the specified voltage – 1.5 or 1.35 volts. The lower voltage modules are sometimes, but not always, identified as DDR3L – see also DDR3 SDRAM.

General characteristics[edit]

200-pin and 204-pin SO-DIMMs are 67.6 mm (2.66 inches) long, 31.75 mm (1.250 inches) wide, having a maximum total depth of 3.8 mm (0.15 inches).[11]

SO-DIMMs are nearly equal in power and voltage rating to DIMMs; SO-DIMM technology does not mean lower performance compared to larger DIMMs. For example, DDR3 SO-DIMMs provide clock speeds such as 533 MHz (1066 MT/s, PC3-8500), CAS latencies such as 7, and higher capacities such as 4 GB per module.[12]

DDR2 SO-DIMM memory modules commonly have clock speeds from 200 MHz upward (specifications). 204-pin SO-DIMMs can also contain DDR3 SDRAM, with specifications such as PC3-6400, PC3-8500, PC3-10600, PC3-14900 and PC3-17000.[13] 260-pin UniDIMMs contain DDR3 or DDR4 SDRAM depending on configuration. Some SO-DIMMs provide ECC functionality; unbuffered ECC SO-DIMMs are called SO-CDIMMs.[14]

See also[edit]

  • Dual in-line package (DIP)
  • Memory geometry – logical configuration of RAM modules (channels, ranks, banks, etc.)
  • Rambus in-line memory module (RIMM)
  • Single in-line memory module (SIMM)
  • Single in-line package (SIP)
  • Zig-zag in-line package (ZIP)

References[edit]

  1. ^ abc'Are DDR, DDR2 and DDR3 SO-DIMM memory modules interchangeable?'. acer.custhelp.com. Retrieved 2015-06-26.
  2. ^Synology Inc. 'Synology RAM Module'. synology.com.
  3. ^'RAMCHECK 100-Pin DDR Adapter, a tool for testing and identifying JEDEC-compliant 100-pin DDR SO-DIMM modules'. memorytesters.com. 2013. Retrieved 2015-06-26.
  4. ^'Small-outline SDRAM module (MT16LSDF3264(L)H 256 MB and MT16LSDF6464(L)H 512 MB) Datasheet'(PDF). Micron Technology. 2006-05-03. p. 22. Retrieved 2015-06-26.
  5. ^'DDR DIMM & SODIMM Modules (184-pin DDR DIMM, 100-pin DDR DIMM, and 200-pin DDR SO-DIMM modules)'(PDF). smartm.com. 2011. p. 4. Retrieved 2015-06-26.
  6. ^'NT2GC64B(C)H4B0PS / NT4GC64B(C)88B0(1)NS / NT8GC64B(C)8HB0NS PC3(L)-10600 / PC3(L)-12800 Unbuffered DDR3 SO-DIMM'(PDF). nanya.com. December 2012. p. 23. Retrieved 2015-06-26.
  7. ^'DDR4 SDRAM SO-DIMM (MTA18ASF1G72HZ, 8 GB) Datasheet'(PDF). Micron Technology. 2014-09-10. p. 18. Archived from the original(PDF) on 2014-11-29. Retrieved 2015-06-26.
  8. ^Geof Findley; Becky Loop (2014-09-16). 'DDR4: The Right Memory for Your Next Server and High-End Desktop System'(PDF). intel.activeevents.com. Intel. p. 28. Archived from the original(PDF) on 2014-12-17. Retrieved 2015-06-26.
  9. ^'How Intel Plans to Transition Between DDR3 and DDR4 for the Mainstream'. techpowerup.com. 2014-09-14. Retrieved 2015-06-26.
  10. ^'DRAM – Can I mix DDR, DDR2 and DDR3 modules-my PC?'. integralmemory.com. Retrieved 2015-06-26.
  11. ^micron.com - 200 Pin, PC2700 DDR SDRAM Unbuffered SO–DIMM REFERENCE DESIGN SPECIFICATIONArchived 2010-09-23 at the Wayback Machine page 26
  12. ^'Corsair Memory – 4GB DDR3 SODIMM Memory (CM3X4GSD1066)'. corsair.com. Retrieved 1 October 2015.
  13. ^'204-Pin DDR3 SDRAM Unbuffered SODIMM Design Specification'.
  14. ^'Define-SO-CDIMM'. RAMpedia. Retrieved 2014-08-24.

Unidimm Vs Ddr4

External links[edit]

Wikimedia Commons has media related to SO-DIMM.
  • Ruggedizing RAM for industrial systems (XR-DIMM form factor)
Retrieved from 'https://en.wikipedia.org/w/index.php?title=SO-DIMM&oldid=984995395'

About DDR3 RAM

DDR3 SDRAM is short for Double Data Rate 3 Synchronous Dynamic Random-Access Memory, which is a type of synchronous dynamic random-access memory (SDRAM) with a high bandwidth interface. Since 2007, it has been in use. Keep reading and then you can know much information about DDR3 RAM in this post offered by MiniTool.

DDR3 RAM is the higher-speed successor to DDR and DDR2, and at the same time, it is also the predecessor to DDR4 synchronous dynamic random-access memory (SDRAM) chips. Due to different signaling voltages, timing, and other factors, DDR3 SDRAM is neither forward nor backward compatible with any previous type of random-access memory (RAM).

The main advantage of DDR3 RAM compared to its direct predecessor, DDR2 SDRAM, is the ability to transfer data at twice the rate (eight times the speed of its internal memory arrays), enabling higher bandwidth or peak data rates.

A 64-bit wide DDR3 module can achieve a transfer rate of up to 64 times the memory clock speed by transmitting twice a cycle of the quad clock signal.

64-bit data is transmitted through each memory module at a time. The transfer rate of DDR3 SDRAM is (memory clock rate) x 4 (for bus clock multiplier) x 2 (for data rate) x 64 (number of bits transmitted) / 8 (number of bits in a byte). Therefore, with a memory clock frequency of 100 MHz, the maximum transfer rate of DDR3 SDRAM is 6400 MB/s.

The DDR3 standard allows DRAM chips with a capacity of up to 8 gibibits, and has a maximum of 4 levels, each of 64 bits, with a total capacity of up to 16 GiB per DDR3 DIMM. Since Ivy Bridge-E did not address hardware limitations until 2013, most older Intel CPUs only support up to 4 Gb chips with 8 GiB DIMMs (Intel's Core 2 DDR3 chipset only supports 2 Gb). All AMD CPUs correctly support the full specifications of 16 GiB DDR3 DIMMs.

History

In February 2005, Samsung released the first prototype of the DDR3 memory chip. Samsung played an important role in the development and standardization of DDR3. In 2007, DDR3 was officially launched.

The main driving force behind the increase in DDR3 usage has been the new Intel Core i7 processors and AMD's Phenom II processor, both of which have internal memory controllers: the former needs DDR3 and the latter recommends it.

In September 2012, the DDR4 RAM, the successor of the DDR3 RAM, was released.

Unidimm Ram

Specs

Compared with DDR2 RAM, DDR3 RAM consumes less power. This reduction comes from the discrepancy in supply voltages: DDR2 is 1.8 V or 1.9 V, while DDR3 is 1.35 V or 1.5V. The 1.5 V supply voltage works well with the 90-nanometer fabrication technology used in the original DDR3 chips. Some manufacturers have also proposed the use of “dual-gate” transistors to reduce current leakage.

According to JEDEC: when memory stability is the primary consideration (such as in a server or other mission-critical device), 1.575 volts should be considered an absolute maximum. What’s more, JEDEC states that memory modules must withstand voltages up to 1.80 volts to suffer permanent damage, although they are not required to function properly at this level.

Udimm Ddr4

Another advantage is that its prefetch buffer is 8-burst-deep. In contrast, DDR2's prefetch buffer is 4-burst-deep, while DDR's prefetch buffer is 2-burst-deep. This advantage is an enabling technology in DDR3 transfer speed.

DDR3 dual-inline memory modules (DIMMs) have 240 pins and are not electrically compatible with DDR2. The key notch locations in DDR2 and DDR3 DIMMs are different, preventing them from being accidentally replaced. Not only are the keyed differently, but the side of DDR2 has round notches, while the side of DDR3 modules has square notches.

For the Skylake microarchitecture, Intel also designed a SO-DIMM package called UniDIMM, which can use DDR3 or DDR4 chips. The CPU's integrated memory controller can then use any of them.

The purpose of UniDIMM is to deal with the transition from DDR3 to DDR4, in which price and availability may require switching RAM types. UniDIMMs have the same dimensions and the number of the pin as regular DDR4 SO-DIMMs, but the notch is located differently to avoid accidental use in an incompatible DDR4 SO-DIMM socket.

DDR3 latencies are numerically higher because the I/O bus clock cycles that measure them are shorter. The actual time interval is similar to the DDR2 delay, about 10 ns.

The power consumption of a single SDRAM chip (or, by extension, DIMM) depends on many factors, including speed, type of usage, voltage and so on. Dell's Power Advisor calculates that each 4 GB ECC DDR1333 RDIMM consumes approximately 4W. In comparison, the more modern mainstream desktop-oriented part 8 GB DDR3/1600 DIMM, is rated at 2.58 W, although being significantly faster.

Unidimm
Tip: You may be interested in this post - [GUIDE] How To Use Hard Drive As RAM On Windows 10.

Bottom Line

Sodimm Vs Udimm Memory

What is DDR3 RAM? After reading this post, you should clearly know that it is a type of synchronous dynamic random-access memory. And you can also get some information about its history and specs.